When electrons are removed/added from/to the outermost shell of an atom, ______are formed.

Isotope

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Isobar

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Ions

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Isotones

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Solution

The correct option is C
Ions

Ions are formed, when the outermost electrons are removed/added.

Example:

Hydrogen has 1 electron in its outermost shell. If this single electron is removed, then the element becomes hydrogen ion.

Flurorine has 7 electrons in its outermost shell. If it gains an electron to complete its octet, the element becomes fluorine ion.

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